Ferro-quadrupolar ordering in PrTi$_2$Al$_{20}$

Details Ferro-quadrupolar ordering in PrTi$_2$Al$_{20}$ Ferro-quadrupolar ordering in PrTi$_2$Al$_{20}$

2011-08-18

arxiv.org/abs/1108.3705v1

Physics

Condensed Matter

Strongly Correlated Electrons

7pages, 7 figure, and 1 table, submitted to PRB

Scientific paper

Origin of the non-magnetic phase transition in PrTi$_2$Al$_{20}$, reported earlier in the macroscopic study, has been asserted microscopically using elastic and inelastic neutron scattering techniques. It has been shown spectroscopically that the crystalline-electric-field ground state is a non-magnetic $\Gamma_3$ doublet, whereas the excited states are two triplets ($\Gamma_4$ and $\Gamma_5$) and a singlet ($\Gamma_1$). The diffraction experiment under external magnetic field shows that the non-magnetic transition is indeed ferro-quadrupolar ordering, which takes place as a consequence of cooperative removal of the ground-state-doublet degeneracy. It is therefore concluded that PrTi$_2$Al$_{20}$ is another rare example of Pr compounds exhibiting non-magnetic quadrupolar order.

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